Container base



FIG. 1 is a perspective view of a container base showing my new design;

FIG. 2 is a front view in elevation thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a sectional view thereof taken along line 5--5 of FIG. 4.

The broken lines in FIG. 2 represent the originally claimed vase which now forms no part of the claimed design. 

The ornamental design for a container base, as shown and described. 